Burnishing of low-alloy steels

A thin iron oxide film forms on the basic material after immersion in hot, concentrated lye. The ingress of special oils imparts corrosion-resistance to this layer.

Because burnishing is a chemical process, a particularly uniform layer is formed across the entire component.

Areas of application (examples):

• Blades in camera lenses
• Screws, machine parts
• Weaponry components

Burnishing of stainless steel = black oxidation

This process is comparable to the burnishing of low-alloy steels. However it allows high-alloy and non-rust steels to be blackened.